These seven building blocks--identity, presence, relationships, conversations, groups, reputation and sharing--provide a good functional definition for social software.

这七个组成部分——身份，状态，关系，交流，小组，名誉，分享——给社交网络软件下了个不错的实用定义。

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In this paper, We give a geometrical definition of conditional expectation. Identity of the definition and other definitions is discussed.

本文给出了条件数学期望的几何定义，证明了该定义与其它定义的一致性。

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Writing from the definition of ethnic identity and its relationship with culture, this paper, based on the study and analysis of a typical case, explains the characteristics of modern ethnic groups.

从族群认同的概念及其和文化的关系出发，通过对一个典型个案的调查和分析，阐述了现代族群的特征。

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"The record is clear. Identity politics is at the core of Judge Sotomayor's self-definition."

VOA: special.2009.07.18

Greater Manchester Police named goths, punks, emos and metallers as people of an "alternative sub-culture identity" in their definition of hate crimes.

BBC: How are goths and emos defined?

In Economics 101, students learn that net investment equals net saving as an identity (that is, as a matter of definition).

FORBES: Obama's Witch Doctor Economists Propose Reducing the Federal Deficit By Spending More